I sized up and wish I would have sized up to a 3XL. I am a 36DD & i'm not sure if that's the reason why it was so tight, but it felt like a large. The head hole was so tiny! I will not be able to wear out. It's not even worth it to return, because even though you pay for shipping for the item, you have to also pay to ship it back. For the price point, it's just not worth it. Very disappointing, because it is so cute!